I own the str-de835 & i never had any problems with mine but every so often i will pop open the top & clean the dust in the unit. i really don't know if that helps ,but i know that dust can create problems over time & i've heard about the 835 & 845 to be known to have problems & sony has never given a real solution to that problem. also read the reviews of those who own or have owned this model here on audio review.com. maybe that can also help too.

i hope that some of this helps you !


mike